CN102177755B - Coordinated power boost and power back-off - Google Patents

Abstract

A system and method are provided for boosting power for a Communications link between a base station and a user device, or user equipment, over a communications link channel in a cellular communications network. In one embodiment, the base station determines whether a communications link for a user device located within a sector of a cell served by the base station needs a power boost. If a power boost is needed, the base station provides a power boost for the communications link for the user device and, for each of one or more neighboring sectors that neighbor the sector in which the user device is located, coordinates the power boost in both frequency and time with a power backoff for a downlink to another user device located in a cell center area of the neighboring sector.

Description

Power ascension and the back-off coordinated

It is the priority of 61/188,609 and 61/188,569 U.S. Provisional Patent Application that the application requires all in the sequence number that on August 11st, 2008 submits to, hereby its full content is incorporated to by reference herein.

Technical field

The present invention relates to provides power ascension (power boost) for wireless communication link.

Background technology

In all cellular communications networks, exist high spectrum efficiency and high area availability or the opposition demand of coverage rate.As the 4th generation (4G) technology, estimate that Long Term Evolution (LTE) can provide high spectrum efficiency.That is, estimate that the spectrum efficiency that down link provides three to four-fold to provide in high-speed downlink packet access (HSDPA) version 6 is provided LTE, provides two to being three times in High Speed Uplink Packet, to access the spectrum efficiency that (HSUPA) version 6 provides and can be up link.In addition, as any cellular communications networks, LTE must provide the coverage rate of 90%-95%, and this is called as the carrier grade service (CGoS) of coverage rate.To the demand of spectral efficient with the opposed reason of the demand of high coverage rate is: the multiplexing factor of expected frequency (N) is little to realize high spectrum efficiency, but generally speaking, the multiplexing factor of expected frequency (N) is high to disturb outside reduction community, and therefore improves coverage rate.When frequency duplex factor as one (N) is 1 while making to be reused in whole frequency spectrum each community at cellular communications networks, realize maximum spectrum efficiency.Yet, outside frequency duplex factor as one (N) is 1 Shi， community, disturb in its maximum, and therefore coverage rate in its worst-case value.

Can in cellular communications networks, exist required minimum signal and the ratio (SINR) of interference plus noise to determine roughly spectrum efficiency according to wireless communication link or airlink.For example, Advanced Mobile Phone System (AMPS) typically requires SINR to be more than or equal to+18 decibels (dB).Thus, in order to realize CGoS in AMPS, need the very large frequency duplex factor as one of N=21 to realize required SINR.As another example, owing to propagating and the result of the caused processing gain of process of expansion is that the SINR value of can be low to moderate-14dB of code division multiple access (CDMA) system operates.Therefore, in cdma system, can use the frequency duplex factor as one of N=1.

For LTE, maintain the required be approximately-5dB of minimum SINR of wireless communication link.Yet for the fully loaded LTE network with the frequency duplex factor as one of N=1, test result shows that the SINR at cell edge place may be lower than-12dB.Therefore, the system and method for improve the coverage rate of LTE cellular communications networks and maintain high channeling is simultaneously had to needs.

Summary of the invention

The present invention relates in cellular communications networks is the communication link bring to power on communication link channel between base station and user's set or subscriber equipment.In one embodiment, described communication link is down link.Described base station is identified for being positioned at the down link of user's set of sector of the community of being served by described base station, and whether required power promotes.More specifically, if described user's set is arranged in the cell edge region of the community of being served by described base station, described base station determines that described down link required power promotes.If required power promotes, described base station provides power ascension for the down link to described user's set, and be each in one or more adjacent sectors adjacent with the sector at described user's set place, aspect frequency-domain and time-domain two, coordinating described power ascension and the back-off of down link of another user's set for to being arranged in the cell centre region of described adjacent sectors.Described one or more adjacent sectors can be all adjacent sectors in neighbor cell or the subset of all adjacent sectors in neighbor cell.In addition, described one or more adjacent sectors can comprise the one or more adjacent sectors in the community at described user's set place.By coordinating, for the power ascension of described user's set and the back-off of down link of other user's sets for to being arranged in the cell centre region of described one or more adjacent sectors, to have alleviated the effect of disturbing increase outside the community being caused by power ascension.

In another embodiment, described communication link is up link.Described base station is identified for being positioned at the up link of user's set of sector of the community of being served by described base station, and whether required power promotes.More specifically, if described user's set is arranged in the cell edge region of the community of being served by described base station, described base station determines that described up link required power promotes.If required power promotes, described base station provides power ascension for the up link rising from described user's set, and be each in one or more adjacent sectors adjacent with the sector at described user's set place, aspect frequency-domain and time-domain two, coordinating described power ascension and the back-off of up link of another user's set for being arranged in the cell centre region of described adjacent sectors.Described one or more adjacent sectors can be all adjacent sectors in neighbor cell or the subset of all adjacent sectors in neighbor cell.In addition, described one or more adjacent sectors can comprise the one or more adjacent sectors in the community at described user's set place.By coordinating, for the power ascension of described user's set and the back-off of up link of other user's sets for to being arranged in the cell centre region of described one or more adjacent sectors, to have alleviated the impact of disturbing increase outside the community being caused by power ascension.

Those skilled in the art below reading by reference to the accompanying drawings after detailed description of preferred embodiments by understanding scope of the present invention and recognize additional aspect of the present invention.

Accompanying drawing explanation

Be incorporated to and form the accompanying drawing of a part of this specification exemplified with some aspects of the present invention, and be used from and explain principle of the present invention with described explanation one.

Fig. 1 provides the power ascension of coordination and the cellular communications networks of back-off therein exemplified with base station according to an embodiment of the invention;

Fig. 2 A and 2B use chart exemplified with power ascension according to an embodiment of the invention;

Fig. 3 A and 3B are that illustration realizes the flow chart of the power ascension of coordination and the base station operation of back-off scheme according to one embodiment of present invention for down link;

Fig. 4 A and 4B are that illustration realizes the flow chart of the power ascension of coordination and the base station operation of back-off scheme according to one embodiment of present invention for up link;

Fig. 5 is the block diagram of base station according to an embodiment of the invention; And

Fig. 6 is the block diagram of subscriber equipment according to an embodiment of the invention (UE).

Embodiment

Each embodiment representative of the following stated makes those skilled in the art can put into practice necessary information of the present invention and exemplified with putting into practice optimum way of the present invention.While illustrating below reading according to accompanying drawing, it should be appreciated by those skilled in the art that concept of the present invention and approval is not proposed to the application of these concepts especially at this.Within it should be understood that these concepts and application drop on the scope of present disclosure and claims.

Fig. 1 is exemplified with cellular communications networks 10 according to an embodiment of the invention.In a preferred embodiment, cellular communications networks 10 is Long Term Evolution (LTE) cellular communications networks.Yet, the invention is not restricted to this.The present invention can be used for any network or cellular communications networks based on community, and wherein expectation is carried out power ascension to improve coverage rate when maintaining spectral efficient.Generally speaking, cellular communications networks 10 comprises several base station 12-1 to 12-7 of the respective cell 14-1 to 14-7 that forms cellular communications networks 10.At this, base station 12-1 to 12-7 and community 14-1 to 14-7 can be referred to as to 12He community, base station 14.Each in community 14 comprises Alpha sector (α), beta sector (β) and gamma sector (γ).Notice, although only show seven base station 12-1 to 12-7 and corresponding community 14-1 to 14-7 for the ease of discussing, for those of ordinary skill in the art, it is evident that, cellular communications networks 10 can comprise any amount of base station 12 and corresponding community 14.In addition,, although in the present embodiment, each community 14 comprises three sectors, the invention is not restricted to this.Each community 14 can comprise any amount of sector.

First Lai Kan community 14-1, the Alpha sector of community 14-1 comprises cell edge region 16-1, community zone line 18-1 and cell centre region 20-1.Equally, the beta sector of community 14-1 and gamma sector comprise respectively cell edge region 16-2 and 16-3, community zone line 18-2 and 18-3 and cell centre region 20-2 and 20-3.Cell edge region 16-1, the 16-2 of the Alpha sector of Ci Jiang community 14-1, beta sector and gamma sector and 16-3 are referred to as the cell edge region 16 of community 14-1.Equally, the community zone line 18 that the community zone line 18-1 of the Alpha sector of Ci Jiang community 14-1, beta sector and gamma sector, 18-2,18-3 are referred to as community 14-1, and cell centre region 20-1, the 20-2 of the Alpha sector of Ci Jiang community 14-1, beta sector and gamma sector and the 20-3 cell centre region 20 that is referred to as community 14-1.

In a preferred embodiment, in the cell edge region 16Shi community 14-1 of community 14-1, the Signal to Interference plus Noise Ratio (SINR) of the communication link (being up link and/or down link) between subscriber equipment (UE) and base station 12-1 is less than minimum SINR (SINR _mIN) region.Minimum SINR (SINR _mIN) preferably maintain with up link and/or the down link of base station 12-1 and be connected required minimum SINR.In LTE cellular communications networks, minimum SINR (SINR _mIN) be about-5 decibels (dB).Up link in 20Shi community, the cell centre region 14-1 of community 14-1 between UE and base station 12-1 and/or the SINR of down link are greater than maximum SINR (SINR _mAX) region.Maximum SINR (SINR _mAX) the SINR value that is preferably maximized for the throughput (throughput) of UE at its place.For LTE cellular communications networks, maximum SINR (SINR _mAX) be about+19dB for single-input single-output (SISO) UE.In LTE cellular communications networks, when SINR be+during 19dB, use modulation and encoding scheme that maximum throughput is provided, it is 64 quadrature amplitude modulation (QAM) with 3/4 code rate.Like this, the raising for surpass+19dB of SINR does not provide any extra throughput.Up link in zone line 18Shi community, the community 14-1 of community 14-1 between UE and base station 12-1 and/or the SINR of down link are greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) region.

The Alpha sector of community 14-2, beta sector and gamma sector comprise: cell edge region 22-1,22-2 and 22-3, community zone line 24-1,24-2 and 24-3 and cell centre region 26-1,26-2 and 26-3.At this, cell edge region 22-1,22-2 and 22-3, community zone line 24-1,24-2 and 24-3 and cell centre region 26-1,26-2 and 26-3 are referred to as respectively to the community zone line 24 of cell edge region 22, community 14-2 and the cell centre region 26 of community 14-2 of community 14-2.As discussed about community 14-1 above, up link and/or down link to UE in the 14-2 of cell edge region 22Shi community have lower than minimum SINR (SINR _mIN) the region of SINR.In the 14-2 of zone line 24Shi community, community, to the up link of UE and/or down link, have and be greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) the region of SINR, and to the up link of UE and/or down link, have and be greater than maximum SINR (SINR in the 14-2 of 26Shi community, cell centre region _mAX) the region of SINR.

The Alpha sector of community 14-3, beta sector and gamma sector comprise cell edge region 28-1,28-2 and 28-3, community zone line 30-1,30-2 and 30-3 and cell centre region 32-1,32-2 and 32-3.At this, cell edge region 28-1,28-2 and 28-3, community zone line 30-1,30-2 and 30-3 and cell centre region 32-1,32-2 and 32-3 are referred to as respectively to the community zone line 30 of cell edge region 28, community 14-3 and the cell centre region 32 of community 14-3 of community 14-3.As discussed about community 14-1 above, up link and/or down link to UE in the 14-3 of cell edge region 28Shi community have lower than minimum SINR (SINR _mIN) the region of SINR.In the 14-3 of zone line 30Shi community, community, to the up link of UE and/or down link, have and be greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) the region of SINR, and to the up link of UE and/or down link, have and be greater than maximum SINR (SINR in the 14-3 of 32Shi community, cell centre region _mAX) the region of SINR.

The Alpha sector of community 14-4, beta sector and gamma sector comprise cell edge region 34-1,34-2 and 34-3, community zone line 36-1,36-2 and 36-3 and cell centre region 38-1,38-2 and 38-3.At this, cell edge region 34-1,34-2 and 34-3, community zone line 36-1,36-2 and 36-3 and cell centre region 38-1,38-2 and 38-3 are referred to as respectively to the community zone line 36 of cell edge region 34, community 14-4 and the cell centre region 38 of community 14-4 of community 14-4.As discussed about community 14-1 above, up link and/or down link to UE in the 14-4 of cell edge region 34Shi community have lower than minimum SINR (SINR _mIN) the region of SINR.In the 14-4 of zone line 36Shi community, community, to the up link of UE and/or down link, have and be greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) the region of SINR, and to the up link of UE and/or down link, have and be greater than maximum SINR (SINR in the 14-4 of 38Shi community, cell centre region _mAX) the region of SINR.

The Alpha sector of community 14-5, beta sector and gamma sector comprise cell edge region 40-1,40-2 and 40-3, community zone line 42-1,42-2 and 42-3 and cell centre region 44-1,44-2 and 44-3.At this, cell edge region 40-1,40-2 and 40-3, community zone line 42-1,42-2 and 42-3 and cell centre region 44-1,44-2 and 44-3 are referred to as respectively to the community zone line 42 of cell edge region 40, community 14-5 and the cell centre region 44 of community 14-5 of community 14-5.As discussed about community 14-1 above, up link and/or down link to UE in the 14-5 of cell edge region 40Shi community have lower than minimum SINR (SINR _mIN) the region of SINR.In the 14-5 of zone line 42Shi community, community, to the up link of UE and/or down link, have and be greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) the region of SINR, and to the up link of UE and/or down link, have and be greater than maximum SINR (SINR in the 14-5 of 44Shi community, cell centre region _mAX) the region of SINR.

The Alpha sector of community 14-6, beta sector and gamma sector comprise cell edge region 46-1,46-2 and 46-3, community zone line 48-1,48-2 and 48-3 and cell centre region 50-1,50-2 and 50-3.At this, cell edge region 46-1,46-2 and 46-3, community zone line 48-1,48-2 and 48-3 and cell centre region 50-1,50-2 and 50-3 are referred to as respectively to the community zone line 48 of cell edge region 46, community 14-6 and the cell centre region 50 of community 14-6 of community 14-6.As discussed about community 14-1 above, up link and/or down link to UE in the 14-6 of cell edge region 46Shi community have lower than minimum SINR (SINR _mIN) the region of SINR.In the 14-6 of zone line 48Shi community, community, to the up link of UE and/or down link, have and be greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) the region of SINR, and to the up link of UE and/or down link, have and be greater than maximum SINR (SINR in the 14-6 of 50Shi community, cell centre region _mAX) the region of SINR.

The Alpha sector of community 14-7, beta sector and gamma sector comprise cell edge region 52-1,52-2 and 52-3, community zone line 54-1,54-2 and 54-3 and cell centre region 56-1,56-2 and 56-3.At this, cell edge region 52-1,52-2 and 52-3, community zone line 54-1,54-2 and 54-3 and cell centre region 56-1,56-2 and 56-3 are referred to as respectively to the community zone line 54 of cell edge region 52, community 14-7 and the cell centre region 56 of community 14-7 of community 14-7.As discussed about community 14-1 above, up link and/or down link to UE in the 14-7 of cell edge region 52Shi community have lower than minimum SINR (SINR _mIN) the region of SINR.In the 14-7 of zone line 54Shi community, community, to the up link of UE and/or down link, have and be greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) the region of SINR, and to the up link of UE and/or down link, have and be greater than maximum SINR (SINR in the 14-7 of 56Shi community, cell centre region _mAX) the region of SINR.

In operation, base station 12-1 to 12-7 communicates to coordinate to the power ascension of the communication link of the UE of each cell edge region of the sector of the community for them (being up link and/or down link) and the back-off to the communication link of the UE in the cell centre region of the adjacent sectors for neighbor cell, the coverage rate of extending thus cellular communications networks 10 via backhaul network 58.Backhaul network 58 can be cable networks such as Ethernet or fiber optic network, wireless network or its combination.More specifically, in one embodiment, take base station 12-1 as example, base station 12-1 monitors the communication link SINR of the UE that is positioned at community 14-1, and the UE that is positioned in this example community 14-1 comprises UE 60, UE 62, UE 64, UE 66 and UE68.Such as UE 68 grades, have and be greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) the UE of communication link SINR be arranged in the community zone line 18 of community 14-1.Like this, base station 12-1 is not for these UE provide power ascension or back-off.

Have and be less than minimum SINR (SINR _mIN) the UE of communication link SINR be positioned at the cell edge region 16 of community 14-1.In this example, UE 60, UE 62, UE 64 are positioned at the cell edge region 16 of community 14-1.For the communication link SINR of UE 60, UE 62 and UE 64 being increased to the degree that can maintain the communication link between base station 12-1 and UE 60, UE 62 and UE 64, base station 12-1 provides power ascension for the communication link for UE 60, UE 62 and UE 64.For each in UE 60, UE 62 and UE 64, the amount of power ascension and minimum SINR (SINR _mIN) relevant with the difference between the communication link SINR of this UE.

Have and be greater than maximum SINR (SINR _mAX) the UE of communication link SINR be positioned at the cell centre region 20 of community 14-1.In this example, UE 66 is positioned at the cell centre region 20 of community 14-1.Because the communication link SINR of UE 66 surpasses for the required communication link SINR of maximum throughput, therefore base station 12-1 is for UE 66 provides back-off, and the gross effect that the caused interference of power ascension in this back-off and adjacent sectors is increased is that the communication link SINR of UE 66 is about maximum SINR (SINR _mAX).

In addition, the effect of the extra interference that the power ascension providing for the communication link alleviating by the UE of the cell edge region 16 for for community 14-1 causes and for fear of the conflict of the signal through power ascension, base station 12-1 is the power ascension in coordination adjacent sectors and back-off aspect frequency-domain and time-domain two.Take UE 60 as example, in a preferred embodiment, base station 12-1 is coordinating aspect frequency-domain and time-domain two for the power ascension of communication link of UE 60 and the back-off of the communication link of UE for each cell centre region to each adjacent sectors to being arranged in the Alpha sector of community 14-1.Therefore, in the present embodiment, base station 12-1 coordinates power ascension and the following back-off for the communication link to UE 60: for the back-off of communication link of UE of cell centre region 26-2 to being arranged in the beta sector of community 14-2, for the back-off of communication link of UE of cell centre region 26-3 to being arranged in the gamma sector of community 14-2, for the back-off of the communication link of the UE in the cell centre region 32-3 of the gamma sector to community 14-3 and for the back-off of the communication link of the UE in the cell centre region 56-2 of the beta sector to community 14-7.In addition, base station 12-1 can coordinate power ascension and the following back-off for UE 60 aspect frequency-domain and time-domain two: for the back-off of the communication link of the UE in the cell centre region 20-2 of the beta sector to community 14-1 and for the back-off of the communication link such as UE such as UE 66 in the cell centre region 20-3 of the gamma sector to community 14-1.

Fig. 2 A and 2B use chart exemplified with power ascension according to an embodiment of the invention.Before concrete discussion Fig. 2 A and 2B, downlink channel and uplink channel need to be described.The downlink channel that base station 12-1 to 12-7 is used has all channel bandwidth that comprises several sub-carrier frequencies, and data are transmitted on described downlink channel.For LTE, downlink channel is OFDM (OFDMA) channel, and it has all channel bandwidth of 1.25 megahertzes (MHz), 2.5MHz, 5MHz, 10MHz, 15MHz or 20MHz according to specific implementation.In all channel bandwidth, data are modulated in several sub-carrier frequencies.In order to be provided for being arranged in the down link of the UE of community 14-1, as required to the Resource Block (RB) in UE allocation of downlink channel.Ten two the continuous sub-carrier frequencies of RB in frequency domain and 14 continuous symbols in time domain form, and this is corresponding to 180 KHz (KHz) in frequency domain and one (1) millisecond (ms) in time domain or one (1) individual subframe.In a similar manner, the uplink channel that base station 12-1 to 12-7 is used has all channel bandwidth that comprises several sub-carrier frequencies, and data are transmitted on described uplink channel.For LTE, uplink channel is single-carrier frequency division multiple access (SC-FDMA) channel, and it has all channel bandwidth of 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz or 20MHz according to specific implementation.In all channel bandwidth, data are modulated in several sub-carrier frequencies.In order to be provided for being arranged in the up link of the UE of community 14-1, to UE, distribute the RB in uplink channel as required.

Fig. 2 A is exemplified with disturbing outside signal power density, thermal noise density and community in all channel bandwidth of the down link in the situation that there is no power ascension or uplink channel.As shown, signal power density spreads all over all channel bandwidth.Fig. 2 B is exemplified with disturbing outside the signal power density after power ascension, thermal noise density and community according to one embodiment of present invention.Take base station 12-1 and UE 60 is example, and for the down link for to UE 60 provides power ascension, base station 12-1 provides reduced bandwidth channel, its subchannel that is downlink channel.In other words, the subset by the sub-carrier frequencies of downlink channel forms this reduced bandwidth channel.In addition, the bandwidth of reduced bandwidth channel is a part for the full bandwidth of downlink channel.By the one or more RB in the downlink allocation reduced bandwidth channel to UE 60, be provided to the down link of UE 60.By by reduced bandwidth channel, for the down link to UE 60, inhibit signal power or through-put power are constant simultaneously, signal power density is concentrated in reduction channel width rather than spreads all over the full bandwidth of downlink channel.Signal power density is concentrated provides power ascension for the down link to UE 60.In an identical manner, can provide power ascension for the up link to UE 60.Notice, although Fig. 2 B by reduced bandwidth channel be illustrated as be several continuously or the sub-carrier frequencies of adjacency, the invention is not restricted to this.The sub-carrier frequencies that forms reduced bandwidth channel can be the sub-carrier frequencies of one or more adjacency, one or more non-adjacent sub-carrier frequencies or its combination.

By concentrating signal power density, compare with the SINR of full bandwidth channel, the SINR of the SINR of every sub-carrier frequencies or every single-frequency (tone) is significantly improved.Particularly, by the SINR (SINR of every channel _cHANNEL) be defined as:

${\mathrm{SINR}}_{\mathrm{CHANNEL}}=\frac{P_{\mathrm{FULL}\_\mathrm{CHANNEL}\_\mathrm{BW}}}{{\mathrm{Interference}}_{\mathrm{FULL}\_\mathrm{CHANNEL}\_\mathrm{BW}}+{\mathrm{Thermal}\_\mathrm{Noise}}_{\mathrm{FULL}\_\mathrm{CHANNEL}\_\mathrm{BW}}}$

P wherein _{fULL_CHANNEL_BW}the total signal power in all channel bandwidth, Interference _{fULL_CHANNELBW}the total interference in all channel bandwidth, and Thermal_Noise _{fULL_CHANNEL_BW}it is the thermal noise power in all channel bandwidth.By the SINR (SINR of the SINR of every sub-carrier frequencies or every single-frequency _tONE) be defined as:

${\mathrm{SINR}}_{\mathrm{TONE}}=\frac{P_{\mathrm{TONE}\_\mathrm{BW}}}{{\mathrm{Interference}}_{\mathrm{TONE}\_\mathrm{BW}}+{\mathrm{Thermal}\_\mathrm{Noise}}_{\mathrm{TONE}\_\mathrm{BW}}}$

P wherein _{tONE_BW}the total signal power in the bandwidth of single-frequency, Interference _{tONE_BW}the total interference in the bandwidth of single-frequency, and Thermal_Noise _{tONE_BW}it is the thermal noise power in the bandwidth of single-frequency.When as shown in Figure 2 A such even of signal power spreads all over full bandwidth, the SINR (SINR of every channel _cHANNEL) equal the SINR (SINR of every single-frequency _tONE).On the contrary, when signal power as shown in Figure 2 B concentrate on like that on reduced bandwidth channel time, by the SINR (SINR of every single-frequency _tONE) be defined as:

SINR _TONE＝SINR _CHANNEL+Power_Boost

Wherein Power_Boost is the concentrated gain causing [dB] in reduced bandwidth channel by signal power.Generally speaking, power ascension is relevant with the ratio of the reduction channel width of reduced bandwidth channel with all channel bandwidth.Particularly, power ascension can be defined as:

$\mathrm{Power}\_\mathrm{Boost}=10\·{\log }_{10}\left(\frac{\mathrm{full}\_\mathrm{channel}\_\mathrm{bandwidth}}{\mathrm{reduced}\_\mathrm{channel}\_\mathrm{bandwidth}}\right)\left[\mathrm{dB}\right]$

Fig. 3 A and 3B are that illustration realizes the flow chart of the power ascension of coordination and the base station operation of back-off scheme according to one embodiment of present invention for down link.For this discussion, Shi Tu1 base station, base station 12-1.Yet this discussion can be applied to other base stations 12-2 to 12-7 in cellular communications networks 10 equally.First, base station 12-1 obtains down link SINR (step 100) from UE.In one embodiment, for LTE cellular communications networks, base station 12-1 sends request indication UE to base station 12-1 reporting channel quality index (CQI) to UE, and wherein CQI comprises the down link SINR of UE.As replying, UE is to base station 12-1 report CQI.

Then, base station 12-1 determines whether the down link SINR of UE is greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) (step 102).In other words, base station 12-1 determines whether UE is arranged in the community zone line 18 of community 14-1.If so, base station 12-1 dispatches the down link of UE with the downlink channel with all channel bandwidth with full transmission power level, and this downlink channel is used suitable modulation and encoding scheme (MCS).More specifically, for LTE cellular communications networks, the down link SINR of base station 12-1 based on UE selects suitable MCS for this UE.In addition, full transmission power level can be the maximum transmission power of base station 12-1 or from the predetermined rollback of the maximum transmission power of base station 12-1.Base station 12-1 by being dispatched to the down link of UE during one or more Transmission Time Intervals (TTI) to the one or more sub-carrier frequencies of the downlink allocation to UE.For LTE cellular communications networks, base station 12-1 is dispatched to the down link of UE by the one or more RB of the downlink allocation to UE.Then this process turns back to step 100 and is repeated.

Turn back to step 102, if the down link SINR of UE is non-, be greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) (if UE is not arranged in the community zone line 18 of community 14-1), base station 12-1 determines whether down link SINR is greater than maximum SINR (SINR _mAX) (step 106).In other words, base station 12-1 determines whether UE is arranged in the cell centre region 20 of community 14-1.If so, in the present embodiment, base station 12-1 determines whether UE is SISO device (step 108).Notice, for LTE cellular communications networks, multiple-input and multiple-output (MIMO) is even if device increases to maximum SINR (SINR at down link SINR _mAX) (for LTE, being about+19dB) also can have the throughput of raising when above.If UE is not SISO device, base station 12-1 is dispatched to the down link of UE with the downlink channel with all channel bandwidth with full transmission power level, and this downlink channel is used suitable MCS (step 110).Base station 12-1 by being dispatched to the down link of UE during one or more TTI to the one or more sub-carrier frequencies of the downlink allocation to UE.For LTE cellular communications networks, base station 12-1 is dispatched to the down link of UE by the one or more RB of the downlink allocation to UE.Then this process turns back to step 100 and is repeated.

Turn back to step 108, if UE is SISO device, base station 12-1 is dispatched to the down link of UE with reduction transmission power level with the downlink channel with all channel bandwidth, this downlink channel is used suitable MCS, thus for the down link to UE provides back-off (step 112).More specifically, base station 12-1 by being dispatched to the down link of UE during one or more TTI to the one or more sub-carrier frequencies of the downlink allocation to UE.For LTE cellular communications networks, base station 12-1 is dispatched to the down link of UE by the one or more RB of the downlink allocation to UE.In addition, at chooser carrier frequency and (one or more) TTI or while selecting the RB to the downlink allocation to UE, base station 12-1 can consider that corresponding base station reported by backhaul network 58 (Fig. 1) about the power ascension in the adjacent sectors of the sector in the community 14-1 of UE place and the information of back-off.For example, if UE is positioned at the information about power ascension and back-off that Zhong，Ze base station, the Alpha sector 12-1 of community 14-1 can consider that the adjacent sectors (being beta sector and gamma sector, the gamma sector of community 14-3 and the beta sector of community 14-7 of community 14-2) from the Alpha sector of community 14-1 is reported.About the information of power ascension and back-off, preferably include to be identified at and currently in adjacent sectors just by base station 12-2,12-3 and 12-7, to it, providing the sub-carrier frequencies of power ascension or RB sub-carrier frequency group and for each the information of amount of power ascension in those sub-carrier frequencies or RB sub-carrier frequency group.In addition, about the information of power ascension and back-off, preferably include to be identified at and currently in adjacent sectors just by base station 12-2,12-3 and 12-7, to it, providing the sub-carrier frequencies of back-off or RB sub-carrier frequency group and for each the information of amount of back-off in those sub-carrier frequencies or RB sub-carrier frequency group.In addition, base station 12-1 can consider the information about the power ascension in the adjacent sectors in the 14-1 of community and back-off.

Once down link is scheduled, base station 12-1 is scheduled and is fed to sub-carrier frequencies or the RB sub-carrier frequency group (step 114) that the down link of UE is used to other base stations 12-2 to 12-7 notice via backhaul network 58.For LTE cellular communications networks, base station 12-1 is used X2 message informing other base stations 12-2 to 12-7.Particularly, base station 12-1 transmits the selected sub-carrier frequencies of down link or the low disturbance state of RB sub-carrier frequency group that is scheduled for UE via relative narrow band transmission (Tx) power (RNTP) designator (indicator).In this, this process turns back to step 100 and is repeated.

Turn back to step 106, if the down link SINR of UE is not more than maximum SINR (SINR _mAX), UE is arranged in the cell edge region 16 of community 14-1.Like this, required power promotes.In the present embodiment, for power ascension is provided, first base station 12-1 obtains the subband SINR (step 116) of each subband downlink channel from UE.In one embodiment, for LTE cellular communications networks, base station 12-1 sends request to obtain the subband CQI of downlink channel to UE.As replying, UE sends the subband CQI that comprises subband SINR to base station 12-1.

Next, power ascension and the back-off information of the adjacent sectors of base station 12-1 based on reported identify the subset for sub-carrier frequencies reduced bandwidth channel, downlink channel, and reduced bandwidth channel is had is enough to provide the reduced bandwidth (step 118) of ideal power lifting.More specifically, when being reduced bandwidth channel chooser carrier frequency or RB sub-carrier frequency group, that base station 12-1 considers is that corresponding base station has been reported by backhaul network 58 (Fig. 1), about the information of the power ascension in the adjacent sectors of sector, UE place and back-off.Like this, for instance, if UE is positioned at the information about power ascension and back-off that Zhong，Ze base station, the Alpha sector 12-1 consideration of community 14-1 is reported from the adjacent sectors (being beta sector and gamma sector, the gamma sector of community 14-3 and the beta sector of community 14-7 of community 14-2) of the Alpha sector of community 14-1.About the information of power ascension and back-off, preferably include to be identified at and currently in adjacent sectors just by base station 12-2,12-3 and 12-7, to it, providing the sub-carrier frequencies of power ascension or RB sub-carrier frequency group and for each the information of amount of power ascension in those sub-carrier frequencies or RB sub-carrier frequency group.In addition, about the information of power ascension and back-off, preferably include to be identified at and currently in adjacent sectors just by base station 12-2,12-3 and 12-7, to it, providing the sub-carrier frequencies of back-off or RB sub-carrier frequency group and for each the information of amount of back-off in those sub-carrier frequencies or RB sub-carrier frequency group.In addition, base station 12-1 can consider the information about the power ascension in the adjacent sectors in the 14-1 of community and back-off.

Power ascension based on about in adjacent sectors and the information of back-off, base station 12-1 can be reduced bandwidth channel chooser carrier frequency or RB sub-carrier frequency group, makes to coordinate mutually with the back-off in adjacent sectors for the power ascension of the down link to UE.Particularly, in one embodiment, base station 12-1 comes for reduced bandwidth channel chooser carrier frequency or RB sub-carrier frequencies according to described power ascension and back-off information, and it is: (1) current back-off and (2) that are just being used in each in adjacent sectors are current less than being just used for power ascension by another adjacent sectors.Then, at least use the subset of selected sub-carrier frequencies or RB sub-carrier frequencies, base station 12-1 provides to compare with all channel bandwidth of downlink channel has abundant reduction so that the reduced bandwidth channel of the reduction channel width of ideal power lifting to be provided.

In a preferred embodiment, the back-off in each adjacent sectors in power ascension and another community is coordinated mutually, and alternatively, coordinates mutually with the back-off in each adjacent sectors in same community.Yet, under the coordination of the back-off in each in power ascension and adjacent sectors any situation in two kinds of situations, may be impossible.The first situation is that one or more in adjacent sectors do not have the cell centre region that any UE is arranged in them, and sub-carrier frequencies or RB sub-carrier frequencies are current, just with back-off, is used to these adjacent sectors.Second case is that one or more in adjacent sectors no longer have current sub-carrier frequencies or the RB sub-carrier frequency group that is just being used to back-off and is thering is no to be just used to the power ascension in another adjacent sectors.Under any situation in these cases, be different from that coordinating power promotes and back-off, base station 12-1 tunable power ascension is avoided and the conflicting of the signal through power ascension from adjacent sectors.Particularly, the power ascension based on reporting for adjacent sectors and back-off information, base station 12-1 can determine which sub-carrier frequencies or which RB sub-carrier frequency group are just being used to the power ascension in adjacent sectors.Then, base station 12-1 can be reduced bandwidth channel and selects other sub-carrier frequencies or other RB sub-carrier frequency group.

In one embodiment, ideal power lifting is minimum SINR (SINR _mIN) and the down link SINR of UE between poor.Outside Zhe community, disturb much smaller than advantageous particularly under the limited situation of coverage rate of thermal noise (l < < n) or the limited situation of noise.Under the limited situation of coverage rate, the SINR for UE being caused by XdB power ascension improves or gain is X dB.In another embodiment, ideal power lifting is SINR _mINthe down link SINR that deducts UE deduct coordinate mutually with power ascension, for the amount of the back-off of sub-carrier frequencies or RB sub-carrier frequency group.Outside Zhe community, disturb much larger than advantageous particularly under the limited situation of interference of thermal noise (l > > n).Disturbing under limited situation, the SINR for UE being caused by the X dB power ascension of coordinating mutually with Y dB back-off improves or gain is X+Y dB.

The desired quantity indirect correlation of the bandwidth of reduced bandwidth channel and power ascension.In one embodiment, can determine reduction channel width based on following equation:

$\mathrm{Power}\_\mathrm{Boost}=10\&CenterDot;{\log }_{10}\left(\frac{\mathrm{full}\_\mathrm{channel}\_\mathrm{bandwidth}}{\mathrm{reduced}\_\mathrm{channel}\_\mathrm{bandwidth}}\right)$

Like this,

$\mathrm{reduced}\_\mathrm{channel}\_\mathrm{bandwidth}=\frac{\mathrm{full}\_\mathrm{channel}\_\mathrm{bandwidth}}{{10}^{\frac{\mathrm{Power}\_\mathrm{Boost}}{10}}}$

Like this, for instance, if ideal power is promoted to every subcarrier 4.77dB, reducing channel width is 1/3 of all channel bandwidth.

Next, base station 12-1 current be UE schedule downlink (step 120) in just experiencing the sub-carrier frequencies disturbed outside low amount or minimum community or the reduced bandwidth channel in RB sub-carrier frequency group.More specifically, subband SINR based on obtaining in step 116, base station 12-1 can identify sub-carrier frequencies or the RB sub-carrier frequency group that subband SINR is greater than threshold value, then select M in those sub-carrier frequencies or RB sub-carrier frequency group, wherein M is corresponding to by the sub-carrier frequencies of downlink allocation or the quantity of RB to UE.In another embodiment, base station 12-1 can select to have M sub-carrier frequencies or the RB sub-carrier frequency group of the highest subband SINR, and wherein similarly, M is corresponding to by the sub-carrier frequencies of downlink allocation or the quantity of RB sub-carrier frequency group to UE.Then, during one or more TTI to the selected sub-carrier frequencies of downlink allocation or the RB sub-carrier frequency group of UE.

Base station 12-1 is scheduled and is fed to sub-carrier frequencies or the RB sub-carrier frequency group (step 122) that the down link of UE is used to other base stations 12-2 to 12-7 notice via backhaul network 58.For LTE cellular communications networks, base station 12-1 is used X2 message informing other base stations 12-2 to 12-7.Particularly, base station 12-1 transmits the selected sub-carrier frequencies of down link or the high interference state of RB sub-carrier frequency group that is scheduled for UE via RNTP designator.In this, this process turns back to step 100 and is repeated.

Notice, in LTE, the shortest RNTP update cycle is 200ms.Like this, RNTP designator can upgrade once by every 200ms at the most.Yet, because the power ascension in the 14-1 to 14-7 of community and back-off situation will probably change in the cycle at this 200ms, so base station 12-1 may be reused in the sub-carrier frequencies that is used to power ascension one or more extra power ascensions during this 200ms cycle.For instance, if base station 12-1 distributes specific RB sub-carrier frequency group to the power ascension of the down link for to UE, if base station 12-1 no longer includes data and will send to this UE, may no longer need the down link of this UE.If this RNTP that occurs in 200ms is in the update cycle, base station 12-1 can be reused in this RB sub-carrier frequency group another power ascension of equivalent or less amount.If do not need such power ascension, base station 12-1 is receiving that next RNTP will not dispatch this RB sub-carrier frequency group before upgrading.In a similar manner, the sub-carrier frequencies that is used to back-off can be reused at the RNTP of 200ms the back-off of one or more extra equivalent or less amount in the update cycle.

Fig. 4 A and 4B are that illustration realizes the flow chart of the power ascension of coordination and the base station operation of back-off scheme according to one embodiment of present invention for up link.For this discussion, Shi Tu1 base station, base station 12-1.Yet this discussion can be applied to other base stations 12-2 to 12-7 in cellular communications networks 10 equally.First, base station 12-1 obtains the up link SINR (step 200) of UE.In one embodiment, base station 12-1 measures the up link SINR of UE.Then, base station 12-1 determines whether the up link SINR of UE is greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) (step 202).In other words, base station 12-1 determines whether UE is arranged in the community zone line 18 of community 14-1.If so, base station 12-1 is dispatched to the up link of UE with the uplink channel with all channel bandwidth with full transmission power level, and this uplink channel is used suitable MCS (step 204).More specifically, for LTE cellular communications networks, the up link SINR of base station 12-1 based on UE selects suitable MCS for this UE.In addition, full transmission power level can be the maximum transmission power of UE or from the predetermined rollback of the maximum transmission power of UE.Base station 12-1 by having dispatched the up link from UE to the one or more sub-carrier frequencies of the uplink allocation to UE during one or more TTI.For LTE cellular communications networks, base station 12-1 has dispatched the up link from UE by the one or more RB of the uplink allocation to UE.Then this process turns back to step 200 and is repeated.

Turn back to step 202, if the up link SINR of UE is non-, be greater than minimum SINR (SINR _mIN) and be less than maximum SINR (SINR _mAX) (if UE is not arranged in the community zone line 18 of community 14-1), base station 12-1 determines whether up link SINR is greater than maximum SINR (SINR _mAX) (step 206).In other words, base station 12-1 determines whether UE is arranged in the cell centre region 20 of community 14-1.If so, in the present embodiment, base station 12-1 determines whether UE is SISO device (step 208).Notice, for LTE cellular communications networks, even if MIMO device increases to maximum SINR (SINR at up link SINR _mAX) (for LTE, being about+19dB) also can have the throughput of raising when above.If UE is not SISO device, the up link that base station 12-1 dispatches UE with full transmission power level with the uplink channel with all channel bandwidth, this uplink channel is used suitable MCS (step 210).Base station 12-1 by being dispatched to the up link of UE during one or more TTI to the one or more sub-carrier frequencies of the uplink allocation to UE.For LTE cellular communications networks, base station 12-1 is dispatched to the up link of UE by the one or more RB of the uplink allocation to UE.Then this process turns back to step 200 and is repeated.

Turn back to step 208, if UE is SISO device, base station 12-1 is dispatched to the up link of UE with reduction transmission power level with the uplink channel with all channel bandwidth, this uplink channel is used suitable MCS, thus for the up link rising from UE provides back-off (step 212).More specifically, base station 12-1 by being dispatched to the up link of UE during one or more TTI to the one or more sub-carrier frequencies of the uplink allocation to UE.For LTE cellular communications networks, base station 12-1 is dispatched to the up link of UE by the one or more RB of the uplink allocation to UE.In addition, at chooser carrier frequency and (one or more) TTI or while selecting the RB to the uplink allocation to UE, that base station 12-1 can consider is that corresponding base station has been reported by backhaul network 58 (Fig. 1), about the power ascension in the adjacent sectors of the sector in the community 14-1 of UE place and the information of back-off.For example, if UE is positioned at the information about power ascension and back-off that Zhong，Ze base station, the Alpha sector 12-1 of community 14-1 can consider that the adjacent sectors (being beta sector and gamma sector, the gamma sector of community 14-3 and the beta sector of community 14-7 of community 14-2) from the Alpha sector of community 14-1 is reported.About the information of power ascension and back-off, preferably include to be identified at and currently in adjacent sectors just by base station 12-2,12-3 and 12-7, to it, providing the sub-carrier frequencies of power ascension or RB sub-carrier frequency group and for each the information of amount of power ascension in those sub-carrier frequencies or RB sub-carrier frequency group.In addition, about the information of power ascension and back-off preferably include to be identified at and currently in adjacent sectors just by base station 12-2,12-3 and 12-7, to it, providing the sub-carrier frequencies of back-off or RB sub-carrier frequency group and for each the information of amount of back-off in those sub-carrier frequencies or RB sub-carrier frequency group.In addition, base station 12-1 can consider the information about the power ascension in the adjacent sectors in the 14-1 of community and back-off.

Once up link is scheduled, base station 12-1 is scheduled and is fed to sub-carrier frequencies or the RB sub-carrier frequency group (step 214) that the up link of UE is used to other base stations 12-2 to 12-7 notice via backhaul network 58.For LTE cellular communication, base station 12-1 is used X2 message informing other base stations 12-2 to 12-7.Particularly, base station 12-1 transmits via LTE high interference designator (HII) or LTE overload indicator (OI) the selected sub-carrier frequencies of up link or the low disturbance state of RB sub-carrier frequency group that is scheduled for UE.In this, this process turns back to step 200 and is repeated.

Turn back to step 206, if the up link SINR of UE is not more than maximum SINR (SINR _mAX), UE is arranged in the cell edge region 16 of community 14-1.Like this, required power promotes.In the present embodiment, for power ascension is provided, first base station 12-1 determines in up link for the amount (step 216) of disturbing outside the community of each sub-carrier frequencies or RB sub-carrier frequency group.In one embodiment, base station 12-1 measures with LET OI outside the community of every RB sub-carrier frequency group and disturbs.

Next, power ascension and the back-off information of the adjacent sectors of base station 12-1 based on reported identify the subset for sub-carrier frequencies reduced bandwidth channel, uplink channel, and reduced bandwidth channel is had is enough to provide the reduced bandwidth (step 218) of ideal power lifting.More specifically, when being reduced bandwidth channel chooser carrier frequency or RB sub-carrier frequency group, that base station 12-1 considers is that corresponding base station has been reported by backhaul network 58 (Fig. 1), about the information of the power ascension in the adjacent sectors of sector, UE place and back-off.Like this, for instance, if UE is positioned at the information about power ascension and back-off that Zhong，Ze base station, the Alpha sector 12-1 consideration of community 14-1 is reported from the adjacent sectors (being beta sector and gamma sector, the gamma sector of community 14-3 and the beta sector of community 14-7 of community 14-2) of the Alpha sector of community 14-1.About the information of power ascension and back-off, preferably include to be identified at and currently in adjacent sectors just by base station 12-2,12-3 and 12-7, to it, providing the sub-carrier frequencies of power ascension or RB sub-carrier frequency group and for each the information of amount of power ascension in those sub-carrier frequencies or RB sub-carrier frequency group.In addition, about the information of power ascension and back-off, preferably include to be identified at and currently in adjacent sectors just by base station 12-2,12-3 and 12-7, to it, providing the sub-carrier frequencies of back-off or RB sub-carrier frequency group and for each the information of amount of back-off in those sub-carrier frequencies or RB sub-carrier frequency group.In addition, base station 12-1 can consider the information about the power ascension in the adjacent sectors in the 14-1 of community and back-off.

Power ascension based on about in adjacent sectors and the information of back-off, base station 12-1 can be reduced bandwidth channel chooser carrier frequency or RB sub-carrier frequency group, makes to coordinate mutually with the back-off in adjacent sectors for the power ascension of a up link from UE.Particularly, in one embodiment, base station 12-1 comes for reduced bandwidth channel chooser carrier frequency or RB sub-carrier frequencies according to described power ascension and back-off information, and it is: (1) current back-off and (2) that are just being used in each in adjacent sectors are current less than being just used for power ascension by another adjacent sectors.Then, at least use the subset of selected sub-carrier frequencies or RB sub-carrier frequencies, base station 12-1 provides to compare with all channel bandwidth of uplink channel has abundant reduction so that the reduced bandwidth channel of the reduction channel width of ideal power lifting to be provided.

In a preferred embodiment, the back-off in each adjacent sectors in power ascension and another community is coordinated mutually, and alternatively, coordinates mutually with the back-off in each adjacent sectors in same community.Yet, under the coordination of the back-off in each in power ascension and adjacent sectors any situation in two kinds of situations, may be impossible.The first situation is that one or more in adjacent sectors do not have the cell centre region that any UE is arranged in them, and for these adjacent sectors sub-carrier frequencies or the current back-off that is just being used to of RB sub-carrier frequencies.Second case is that one or more in adjacent sectors no longer have current sub-carrier frequencies or the RB sub-carrier frequency group that is just being used to back-off and is thering is no to be just used to the power ascension in another adjacent sectors.Under any situation in these cases, be different from that coordinating power promotes and back-off, base station 12-1 tunable power ascension is avoided and the conflicting of the signal through power ascension from adjacent sectors.Particularly, the power ascension based on reporting for adjacent sectors and back-off information, base station 12-1 can determine which sub-carrier frequencies or which RB sub-carrier frequency group are just being used to the power ascension in adjacent sectors.Then, base station 12-1 can be reduced bandwidth channel and selects other sub-carrier frequencies or other RB sub-carrier frequency group.

In one embodiment, ideal power lifting is minimum SINR (SINR _mIN) and the up link SINR of UE between poor.Outside Zhe community, disturb much smaller than advantageous particularly under the limited situation of coverage rate of thermal noise (l < < n) or the limited situation of noise.Under the limited situation of coverage rate, the SINR for UE being caused by XdB power ascension improves or gain is X dB.In another embodiment, ideal power lifting is SINR _mINthe up link SINR that deducts UE deducts the amount of the back-off for sub-carrier frequencies or RB sub-carrier frequency group of coordinating mutually with power ascension.Outside Zhe community, disturb much larger than advantageous particularly under the limited situation of interference of thermal noise (l > > n).Disturbing under limited situation, the SINR for UE being caused by the X dB power ascension of coordinating mutually with Y dB back-off improves or gain is X+Y dB.

The desired quantity indirect correlation of the bandwidth of reduced bandwidth channel and power ascension.In one embodiment, can determine reduction channel width based on following equation:

$\mathrm{Power}\_\mathrm{Boost}=10\&CenterDot;{\log }_{10}\left(\frac{\mathrm{full}\_\mathrm{channel}\_\mathrm{bandwidth}}{\mathrm{reduced}\_\mathrm{channel}\_\mathrm{bandwidth}}\right)$

Like this,

$\mathrm{reduced}\_\mathrm{channel}\_\mathrm{bandwidth}=\frac{\mathrm{full}\_\mathrm{channel}\_\mathrm{bandwidth}}{{10}^{\frac{\mathrm{Power}\_\mathrm{Boost}}{10}}}$

Like this, for instance, if ideal power is promoted to every subcarrier 4.77dB, reducing channel width is 1/3 of all channel bandwidth.

Next, base station 12-1 current be UE scheduling uplink (step 220) in just experiencing the sub-carrier frequencies disturbed outside low amount or minimum community or the reduced bandwidth channel in RB sub-carrier frequency group.More specifically, outside community based on recording in step 216, disturb, base station 12-1 can disturb sub-carrier frequencies or the RB sub-carrier frequency group that is less than threshold value outside identifying cells, then select M in those sub-carrier frequencies or RB sub-carrier frequency group, wherein M is corresponding to by the sub-carrier frequencies of uplink allocation or the quantity of RB to UE.In another embodiment, base station 12-1 can select to have outside minimum community M sub-carrier frequencies or the RB sub-carrier frequency group of disturbing, and wherein similarly, M is corresponding to by the sub-carrier frequencies of uplink allocation or the quantity of RB sub-carrier frequency group to arriving UE.Then, during one or more TTI to the selected sub-carrier frequencies of uplink allocation or the RB sub-carrier frequency group of UE.

Base station 12-1 is scheduled and is fed to sub-carrier frequencies or the RB sub-carrier frequency group (step 222) that the up link of UE is used to other base stations 12-2 to 12-7 notice via backhaul network 58.For LTE cellular communications networks, base station 12-1 is used X2 message informing other base stations 12-2 to 12-7.Particularly, base station 12-1 transmits via LTE HII or LTE OI the selected sub-carrier frequencies of down link or the high interference state of RB sub-carrier frequency group that is scheduled for UE.In this, this process turns back to step 200 and is repeated.

Fig. 5 is the block diagram of exemplary embodiment of the base station 12-1 of Fig. 1.Yet this discussion can be applied to other base stations 12-2 to 12-7 in cellular communications networks 10 equally.Generally speaking, base station 12-1 comprises control system 70, and this control system 70 has the memory 72 being associated.In addition, in the present embodiment, base station 12-1 comprises sector transceiver 74-1,74-2 and the 74-3 of the Alpha sector, beta sector and the gamma sector that are respectively used to community 14-1 (Fig. 1).The hardware of part that can formation control system 70, be stored in software in memory 72 or its and combine to realize above discussed for the function of the base station 12-1 of power ascension is provided.

Fig. 6 is the block diagram of the UE 60 of Fig. 1.This discussion can be applied to other UE in cellular communications networks 10 equally.Generally speaking, UE 60 comprises control system 76, and this control system 76 has the memory 78 being associated.In addition, UE 60 comprises cellular communication interface 80.Can be to be stored in the function of the UE 60 about power ascension more than realization being discussed in the protocol stack of the cellular communication interface 80 that software in memory 78 realizes or its combination.UE 60 can also comprise user interface 82, and this user interface 82 can comprise for instance the parts such as one or more user input apparatus (such as microphone, keyboard etc.), one or more loud speaker, display etc.

Those skilled in the art will recognize that improvement and modification for the preferred embodiments of the present invention.All such improvement and modification are considered to be encompassed in herein and subsequently within the scope of the appended disclosed concept of claim.

Claims (22)

1. the base station in operation honeycomb communication network thinks that the communication link on communication link channel between described base station and user's set provides a method for power ascension, and described method comprises:

Determine whether required power promotes for the communication link between described base station and described user's set, and described user's set is positioned at the sector of the community of being served by described base station; And

If promoted for the communication link required power between described base station and described user's set, for the communication link between described base station and described user's set provides power ascension, described power ascension all with for the back-off of the second user's set in cell centre region that is arranged in the adjacent sectors of sector, described user's set place is being coordinated aspect frequency-domain and time-domain two mutually.

2. method according to claim 1, wherein for providing described power ascension to be included as described communication link, described communication link provides described power ascension, make for comprise in a plurality of adjacent sectors of sector described adjacent sectors, described user's set place each, described power ascension all with for the back-off of the second user's set that is arranged in the cell centre region of of described a plurality of adjacent sectors is being coordinated aspect frequency-domain and time-domain two mutually.

3. method according to claim 2, wherein said a plurality of adjacent sectors comprise in following every set forming: the subset of all adjacent sectors outside all adjacent sectors outside the community of being served by described base station and the community of being served by described base station.

4. method according to claim 3, wherein said a plurality of adjacent sectors also comprise in following every set forming: the subset of all adjacent sectors within all adjacent sectors within the community of being served by described base station and the community of being served by described base station.

5. method according to claim 2, wherein said communication link channel has all channel bandwidth that comprises a plurality of sub-carrier frequencies, and comprises for described communication link provides described power ascension:

Power ascension based on about in described a plurality of adjacent sectors and the information of back-off are designated the reduced bandwidth channel for the communication link to described user's set by the subset of a plurality of sub-carrier frequencies of described communication link channel, make described reduced bandwidth channel have than the little reduced bandwidth of all channel bandwidth of described communication link channel and promote corresponding to ideal power; And

With described reduced bandwidth channel, be dispatched to the communication link of described user's set, make signal power concentrate in the subset of the described a plurality of sub-carrier frequencies in described reduced bandwidth channel rather than be distributed in whole described all channel bandwidth, thus for described communication link provides described power ascension.

6. method according to claim 5, wherein comprises that about the information of the power ascension in described a plurality of adjacent sectors and back-off from a plurality of sub-carrier frequencies of described communication link channel sign is used to the information that sign in the information of sub-carrier frequencies of the power ascension in described a plurality of adjacent sectors and a plurality of sub-carrier frequencies from described communication link channel is used to the sub-carrier frequencies of the back-off in described a plurality of adjacent sectors.

7. method according to claim 6, the subset of described a plurality of sub-carrier frequencies of wherein said communication link channel comprises the sub-carrier frequencies that is just being used to the back-off in each in described a plurality of adjacent sectors in a plurality of sub-carrier frequencies of described communication link channel and be not just used to the power ascension in any in described a plurality of adjacent sectors.

8. method according to claim 6, if wherein there is not for the one or more adjacent sectors in described a plurality of adjacent sectors the sub-carrier frequencies that is used to back-off, the subset of described a plurality of sub-carrier frequencies of described communication link channel comprises the sub-carrier frequencies that be not just used to the power ascension in described one or more adjacent sectors in a plurality of sub-carrier frequencies of described communication link channel.

9. method according to claim 6, if wherein do not exist and be used to back-off and be not just used to the sub-carrier frequencies of the power ascension in another adjacent sectors in described a plurality of adjacent sectors for the one or more adjacent sectors in described a plurality of adjacent sectors, the subset of described a plurality of sub-carrier frequencies of described communication link channel comprises the sub-carrier frequencies that be not just used to the power ascension in described one or more adjacent sectors in a plurality of sub-carrier frequencies of described communication link channel.

10. method according to claim 5, is wherein included in during the Transmission Time Interval that only uses described reduced bandwidth channel to the communication link to described user's set and distributes the one or more sub-carrier frequencies in the subset of the described a plurality of sub-carrier frequencies in described reduced bandwidth channel with the communication link that described reduced bandwidth channel is dispatched to described user's set.

11. methods according to claim 10, it also comprises:

Determine the amount of disturbing for outside the community of each sub-carrier frequencies in the subset of a plurality of sub-carrier frequencies described in described user's set;

Wherein to the communication link to described user's set, distribute one or more sub-carrier frequencies in the subset of the described a plurality of sub-carrier frequencies in described reduced bandwidth channel to comprise in the communication link to described user's set distributes the subset of the described a plurality of sub-carrier frequencies in described reduced bandwidth channel and there are one or more sub-carrier frequencies of disturbing outside minimum community.

12. methods according to claim 1, wherein determine whether required power lifting comprises for described communication link:

Obtain the Signal to Interference plus Noise Ratio (SINR) of described communication link; And

If described SINR is less than predetermined threshold, determine that required power promotes.

13. methods according to claim 12, wherein said predetermined threshold be maintain and described base station between the required minimum SINR of communication link.

14. methods according to claim 12, it also comprises:

If described SINR is greater than predetermined max-thresholds, determine required power rollback; And

If required power rollback:

Determine ideal power rollback; And

With described ideal power rollback, with the communication link channel with all channel bandwidth, be provided to the communication link of described user's set.

15. methods according to claim 14, are wherein included in described ideal power rollback and use during the Transmission Time Interval of all channel bandwidth of described communication link channel to the communication link to described user's set and distribute the one or more sub-carrier frequencies in a plurality of sub-carrier frequencies in all channel bandwidth of described communication link channel with the communication link that the communication link channel with all channel bandwidth is provided to described user's set with described ideal power rollback.

16. methods according to claim 1, its also comprise if for to the communication link of described user's set neither required power promote also not required power rollback, with full through-put power, with the communication link channel with all channel bandwidth, be provided to the communication link of described user's set.

17. methods according to claim 16, are wherein included in described full through-put power and use during the Transmission Time Interval of all channel bandwidth of described communication link channel to the communication link to described user's set and distribute the one or more sub-carrier frequencies in a plurality of sub-carrier frequencies in all channel bandwidth of described communication link channel with the communication link that the communication link channel with described all channel bandwidth is provided to described user's set with described full through-put power.

18. methods according to claim 1, wherein said communication link channel is downlink channel, and described communication link is down link.

19. methods according to claim 18, wherein said downlink channel is OFDM (OFDMA) channel.

20. methods according to claim 1, wherein said communication link channel is uplink channel, and described communication link is up link.

21. methods according to claim 20, wherein said uplink channel is single-carrier frequency division multiple access (SC-FDMA) channel.

Base station in 22. 1 kinds of cellular communications networks, described base station comprises:

One or more sectors transceiver, it provides communication link via communication link channel to the user's set that is positioned at the community of the cellular communications networks of being served by described base station; And

Control system, it is associated and is suitable for described one or more sectors transceiver:

Determine whether required power promotes for the communication link between described base station and user's set, and described user's set is positioned at the sector of the community of being served by described base station; And

If promoted for the communication link required power between described base station and described user's set, for the communication link between described base station and described user's set provides power ascension, described power ascension all with for the back-off of the second user's set in cell centre region that is arranged in the adjacent sectors of sector, described user's set place is being coordinated aspect frequency-domain and time-domain two mutually.

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